|  | @@ -35,3 +35,8 @@ FROM fedora:21
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				|  |  |  RUN yum install -y yum-plugin-ovl
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				|  |  |  
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				|  |  |  RUN yum clean all && yum update -y && yum install -y python python-pip
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				|  |  | +
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				|  |  | +# Upgrading six would fail because of docker issue when using overlay.
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				|  |  | +# Trying twice makes it work fine.
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				|  |  | +# https://github.com/docker/docker/issues/10180
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				|  |  | +RUN pip2 install --upgrade six || pip2 install --upgrade six
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